mkdir -p build
cd build
rm -rf ./*

cmake -DCMAKE_TOOLCHAIN_FILE=/work/tools/android-ndk-r16b/build/cmake/android.toolchain.cmake \
      -DANDROID_NDK=/work/tools/android-ndk-r16b \
      -DANDROID_ABI=arm64-v8a \
      -DANDROID_TOOLCHAIN=clang \
      -DANDROID_PLATFORM=android-16 \
      -DANDROID_STL=c++_shared \
		.. -G Ninja

#make -j4
ninja -C ./

